Screening Technique for Loading Pattern Optimization by Simulated Annealing

摘要

The simulated annealing (SA) algorithm has beenrnpopularly adopted for the optimum fuel assembly (FA)rnloading pattern (LP) search calculations in reload corerndesign of light water reactors. However, it has a majorrndrawback of long computing time because it requiresrnneutronics evaluation of tens of thousands of trial LPs in therncourse of the optimization. To reduce the computing time, arnsimple -dimensional (D) neutronics model (D modelrnhereafter) has been used . The problem here is that thernfinal LP from the D SA calculations often turns out to bernunsatisfactory when it was subjected to detailed evaluationrnby D neutronics evaluation model (D model hereafter). Arnsimple and straightforward way of resolving this problemrnwould be to perform D model SA calculation at thernexpense of a much longer computation time.